the stage when all the dishes in your appartment have been used and you are too lazy to wash them so as a substitute you need to use tupperware boxes when you cooked and want to eat something

right after that comes the pot stage, where you eat directly out of the pot where you just cooked your meal in

The tupperware stage is reached when you're having a stressful time and are not in the mood to do the dishes, but the pile of dirty dishes gets bigger and bigger and the only option you have is to put your cooked food in a tupperware box and eat out of it